Patentsview API Bugs

It looks like your query can't be q={"_and":[{"govint_org_id":"54"},{"govint_org_id":"44"}]}
which would be looking for patents associated with two different government orginazalions.

The query returns no results though four patents meet this criteria as illustrated by q={"patent_number":[8387443,9720067,8825466,9478429]} I'd guess that this is a feature, not a bug, something that would be difficult "fix" and applies to any of the fields like classifications where there can be more than one value per patent. Basically, you can't _and in the same field and expect results.